Dupljanin, Đorđije, Tatjana Savković, Slaviša Dumnić, Milica Miličić, and Milica Marčeta. 2019. “The Study of CO2 Emissions for Postal Traffic Vehicles in the Territory of Vojvodina”. Journal of Road and Traffic Engineering 63 (2), 49-53. https://www.putisaobracaj.rs/index.php/PiS/article/view/85.